Dang thats gotta be a big wing nut
I purchased a 1/4-20 from classic ind, used a tapered punch to stretch out the 1/4" hole to somewhere under 5/16" and tapped the thread with a 5/16-18 tap. worked surprisingly well! (but I would love to have an NOS or good OE hint hint)
1967 Dodge Dart Parts | MF230 | 1962-74 Mopar 1/4-20 Air Cleaner Wing Nut | Classic Industries
Amazon has some 5/16-18 listed that look pretty good but they never seem to be in stock even if they say they are.(I bought and paid and a month later no nuts so got refund) but worth a try!
https://www.amazon.com/dp/B00Z3X12TC/?tag=joeychgo-20
https://www.amazon.com/dp/B01MY9X97Y/?tag=joeychgo-20
https://www.amazon.com/dp/B002YP4DEI/?tag=joeychgo-20
I purchased a 1/4-20 from classic ind, used a tapered punch to stretch out the 1/4" hole to somewhere under 5/16" and tapped the thread with a 5/16-18 tap. worked surprisingly well! (but I would love to have an NOS or good OE hint hint)
1967 Dodge Dart Parts | MF230 | 1962-74 Mopar 1/4-20 Air Cleaner Wing Nut | Classic Industries
Amazon has some 5/16-18 listed that look pretty good but they never seem to be in stock even if they say they are.(I bought and paid and a month later no nuts so got refund) but worth a try!
https://www.amazon.com/dp/B00Z3X12TC/?tag=joeychgo-20
https://www.amazon.com/dp/B01MY9X97Y/?tag=joeychgo-20
https://www.amazon.com/dp/B002YP4DEI/?tag=joeychgo-20
